18077281655 has 16 divisors (see below), whose sum is σ = 21801752640. Its totient is φ = 14389331712.

The previous prime is 18077281633. The next prime is 18077281693. The reversal of 18077281655 is 55618277081.

It is a cyclic number.

It is not a de Polignac number, because 18077281655 - 2¹⁰ = 18077280631 is a prime.

It is a super-2 number, since 2×18077281655² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 809297 + ... + 831333.

It is an arithmetic number, because the mean of its divisors is an integer number (1362609540).

Almost surely, 2^18077281655 is an apocalyptic number.

18077281655 is a deficient number, since it is larger than the sum of its proper divisors (3724470985).

18077281655 is a wasteful number, since it uses less digits than its factorization.

18077281655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22858.

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 18077281655 in words is "eighteen billion, seventy-seven million, two hundred eighty-one thousand, six hundred fifty-five".